This is a 16S Elgin Giant, 14 kt. Double stock very high quality case. This case was made for a pendant or lever set movements. There are a couple imperfections from use over the years so please use the photos to make a good decision. Case: Open Face, both covers screw on/off. Maker:Elgin Watch Case Co. Material: 20 year gold filled. Outside D : 51.0 mm. Inside D : 53 mm. Please use the photos as a big part of the description and please contact me with any questions.